gatfu
Member
Hi all! I was looking for a little help in determining a better way of accomplishing a current process that is not to efficient with in my program. Here is the set up....
ML1400 running RSlogix 500
1 Thermocouple
1 Ignitor
During our operation we divert Syn gas to a blow off flu. At the point of diversion we are turning on the ignitor to lit off the excess gas. Once we have reached a temperature of 600 deg f we then turn off the ignitor. Here in lies my problem. The gas always lights at different temps, sometimes at 550 sometimes at 300 all depending on the quality of the gas coming through the flu. If it lights at 550 then it only takes a minute or so for the thermocouple to reach 600 and then turn of the ignitor however if it lights at 300 then it could take as long as 5 minutes to turn the ignitor. this is terribly inefficient as well as it dramatically decreases the life of the ignitor being on all that time.
I am trying to figure a way to program it so that once the PLC sees the thermocouple rising at a steady rate then to shut the ignitor instead of waiting to reach a certain temp. I believe this is totally doable however I am not to good with the advanced math instructions. Any help in accomplishing this is greatly appreciated!
ML1400 running RSlogix 500
1 Thermocouple
1 Ignitor
During our operation we divert Syn gas to a blow off flu. At the point of diversion we are turning on the ignitor to lit off the excess gas. Once we have reached a temperature of 600 deg f we then turn off the ignitor. Here in lies my problem. The gas always lights at different temps, sometimes at 550 sometimes at 300 all depending on the quality of the gas coming through the flu. If it lights at 550 then it only takes a minute or so for the thermocouple to reach 600 and then turn of the ignitor however if it lights at 300 then it could take as long as 5 minutes to turn the ignitor. this is terribly inefficient as well as it dramatically decreases the life of the ignitor being on all that time.
I am trying to figure a way to program it so that once the PLC sees the thermocouple rising at a steady rate then to shut the ignitor instead of waiting to reach a certain temp. I believe this is totally doable however I am not to good with the advanced math instructions. Any help in accomplishing this is greatly appreciated!